Method of treating sodium peroxid.



D. E. PARKER. METHOD OF TREATING SODIUM PEROXID.

APPLIOATIQN FILED AUG. 21, 1906.

935,542, Patented Sept. 28, 1909.

FIG. 1

5 I j! j l ,8 LI j WITNESSES g a fi Ex- K INVENTOH u%%% UNITED sTnr fiPATENT OFFICE.

DAVID E. PARKER, OI NIAGARA FALLS, NEW YORK.

METHOD or TREATING som'um PEROXID.

Patented Sept. 2s. 1909.

Original application filed May 18, 1906, Serial No. 817,516. Divided andthis application filed August 27.

1906. Serial No. 332,121.

To all whom it may concern:

Be it known that 1, DAVID E. PARKER, a

citizen of the United States, residing at Niagara Falls, in the countyof Niagara and State of New York, have invented certain new and usefulImprovements in Methods of Treating Sodium Peroxid, of which thefollowing is.a specification, the samebeing a division of my applicationfiled May 18, woo, Serial No. 317,516.

This invention relates to the process of treating sodium peroxid for thepurpose oi oi 'nninating deleterious a'ses therefrom such as carbonicacid gas, an for converting the peron id from powder to solid form thatwhen the same is subjected to the action of carbonic acid gas bysubjecting the peroxid to the eflects of an electric current of suchalue as to melt the peroxid and raise the same to a temperaturesuthcient to drive oilthe carbonic acid gas without, however, fl'tt ingthe oxygen. It has been demonstrated by practice, that the carbonic acidgas will pass oil at a lower temperature than the oxygen and that themolten peroxid forms a liberation of the carbonic acid gas.

conductor for the current. and that the passage of the current creates agentle agitation of the molten material which facilitates the After thcgas is thus allowed to cscape, the molten matcriah is removed from theinfluence of thc current-and placcd in suitable molds for forming thematerial into'briqucts so as to be conveniently handled. product isknown in the trade as oxone and is intended primarily as anoxygen-producing agent for medicinal and other purposes, it hcing mcrclynecessary to subject the briqucts to the action of water for freeing theThe resulting.

nal section of the apparatus. Fig-2 is :1

transverse section thereof showing the peroxid fcedmghopper removed.-

Referring to the drawing, 2 designates the base of the machine fromwhich rises spaced standards 3 that support a-horizoiitally-disposedmelting pot 8 which is open to the atmosphere at its top and is adaptedto, tilt on trunnions journaled-in the standards 3. The,

pot 8, which is preferably constr ucted of copper, is surrounded by awater jacket for the )urpose of maintaining the pot sntlicient y cool'to prevent the sodium peroxid immediately adjaceiit the pot frombecoming melted. On op )osite ends of the pot are binding posts 4 orconnection with a direct or alternatingcurrentcircuit and these bindingposts are connected, respectively, with electrodes 5 that. extend intothe pot adjaccntthe ends thereof so that current will pass from one tothe other through the peroxid durin the treatment thereof. The initialpath or the-current between the elecsodium peroxid by means of a screwlocated in the spout at the bottom of the hopper. Extending from oneside of the meltin pot or ladle 8 is-the spout 8 through whic the moltenperoxid is finally discharged into a briquet mold 7 which iswater-jacketed for cooling the briquets, the water jacket of the meltingpot and mold being'connected together by a pipe 7' through which wateris forced.

In practice. the peroxid i's'supplied to the melting ot in powdered formand when in this condition, is does not serve as a conductor for-theelectric current. It is, therefore, necessary to provide the resistance5 between the electrodes for the double purpose of providing an initialpath for the current and a heating element for starting the melting ofthe peroxid. After the current has passed through the apparatus for ashort interval, the peroxid in contact with the resistance is melted andis thereby converted into a conductor for the current. The resistance 5"is then preferably removed so that the entire current passes through theperoxid from one electrode to the other, with the result that themelting process continues and a bath is formed lJiWQGIl the electrodesand extending close to the wa ls of the cop per melting pot which iskept relatively cool by the water jacket. By thus cooling the waterjacket. the peroxid in contact with the melting pot is prevented fromfusing so that, in effect, there. will be a lining of resistancematerial formed between the molten peroxid and the kettle, thuspreventing the formation of a ground through the machine whercby currentwill pass from the molten material. The strength of the current is carefully adjusted so that the temperature of the molten peroxid will bemaintained between 710 and 7l8 F., because of the fact that within thisrange, the deleterious gases are eliminated from the pcroxid withoutdanger of the oxygen being thrown ott'. As long as the temperature ismaintained at this point, the molten material is kept by the current ina. gentle state of agitation which accompanies the liberation of thearbonic acid gases. In case, however, the temperature should be raisedto a point between T20 and 730 F., ebullit-ion takes place and oxygen isdriven off. As this would produce an inferior product, it is extremelyimportant that the temperature should be kept below these points. Inpractice, it has'been found that with a furnace having electrodes abouttwenty-three inches apart and in, which about thirty pounds of sodiumperoxid is treated, the current should be maintained for thirty minutes,more or less, to effectively drive off the. deleterious gases, and afterthis time the molten material is poured out intothe'briquet molds Tbytilting the melting pot while the current continues to pass through themachine. After part of the molten material is thus removed, a secondcharge of powdered peroxid is supplied to the melting pot and is readilymelted by the current which continues to flow through the molten peroxidwhich is allowed to remain from the first charge. After the secondcharge is treated, the required length of time, the molten material ispoured out and fori'ned into briquets in the same manner.

It will thus be seen that the process can be carried on continuouslyafter the machine once started. with the assistance of the resistance.

Having thus described the invention, what I claim as new, and desire tosecure by LettersPatent, is: i Y

1.. The herein described process of treating sodium. peroxid whichconsists in subjectingthe peroxid to an electric current for melting thesame, maintaining the temperature of the melted peroxid by the electriccurrent at such a point as to liberate any carbonic acid gas containedtherein without freeing the oxygen from the molten mate rial, andfinally solidifying the electricallytreated material.

2. The herein described process of treating sodium peroXid whichconsists in passing an electric current through a resistance in contactwith the 'peroxid for melting the same, continuing the passage of thecurrent through the molten peroxid to produce 'atemperature suflicient.to liberate any carbonic acid gas contained therein without freeing theoxygen, and finally removing the molten material from the influence ofthe current and solidifying the material.

The herein described process of treating sodium peroxid which consistsin placing the peroxid between and in contact with spaced electrodes anda resistance connecting the electrodes, passing a current through theelectrodes and resistance for melting the peroxid immediately adjacentthereto, con tinuing the flow of the current through the molten materialfor simultaneously heating and agitating the same to liberate anycarbonic acid gas contained therein, and finally removing the moltenmaterial from the inllucnce'of the current.

4t. The herein described process of treating sodium peroxid whichconsists in placing contact with spaced electrodes and a resistanceconnectedtherewith, passing a current through the resistance andelectrodes for melting theperoxid, maintaining the flow of currentthrough the melted peroxid for heating and, agitating the same by thecurrent to liberate deleterious gases contained therein, and solidifyingthe molten material.

5. The herein described process of treating alkali peroxid whichconsists in placing the peroxid in an open receptacle, passing a currentof electric energy through the peroxid for melting a portion thereofwhile main taining the renuiinder of the peroxid. adjacent the walls ofthe receptacle in its original condition, maintaining the current atsuch a value as to heat the molten peroxid to a temperature forliberating deleterious gases contained therein without freeing theoxygen, and finally solidifying the molten material.

6. The herein described process of treating -l05 the pcroXid in an openreceptacle and in alkali peroxid which consists in subjecting ence ofthe current and allowing the matea mass of peroxid to the passage of anelectric current between two electrodes to melt that portion of the massbetween the latter 5 while the remainder of the mass retains itsoriginal form, producing a temperature in i the melted peroxid by thecurrent sufficient to liberate deleterious gases contained thereinwithout freeing the oxygen, and finally 0 removing the melted peroxidfrom the influrial to solidify.

In testimony whereof, I have signed my name to this specification in thepresence of two subscribing witnesses, this 11" day of August 1906.

DAVID E. PARKER.

Witnesses:

GEORGE S. WARDER,

T. J. VAN AMBURGH.

